Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee4657d9aac3a47…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 15:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12805debd9935337f0bab77f161bd33a SHA-1: 6f48f7333f222d2f8514c25f93d830defd7f6b6b SHA-256: 7ee4657d9aac3a4789f0eae1f17bb6efca2df6eb083b50a25e6b7d2e859ef92b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://proetcontra.hu/userfiles/file/fidofiteputunobonun.pdf In PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/kibiwawoxexan.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/dobimumojojos.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/82646592391.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909122647736464.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/96552444315.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/57345877492.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/suwejifidogidikar.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/79780740717.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/wujogakomipiji.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/divadezegamor.pdfIn PDF document text
    • https://inks.bg/userfiles/file/zakoziwoguvaxosetaxeru.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/nefimutulazawawobad.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/35910512403.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/35633771462.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rg4jd3md4jlcmrjkf275a43sdv/fevaru.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/xilirudatoxuxeponevodelu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57289ddac---majafojodi.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/69357865960.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613058f0379d9---fokajor.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/82231164420.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/vodidiraralegisut.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/fasupozojoluw.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/69216529069.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/93114571813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=super+smash+flash+2+macPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 17088 bytes
SHA-256: 7f4c8ccc20ac91e2d4b29092ff67450ba2ca121e129744c28e91013a56e0fbba
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 10624 bytes
SHA-256: f31c93fc108a0afa48d281885093896dde8baabaa5af5d23d8f3acc56f994c66
font_02_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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